Patent GB-749416-A (GB)
Title: An apparatus for automatically scoring glass sheet and subsequently cracking off the scored glass sheet
Inventor: KURATA MOTOHARU
Filed: 1954-07-05
Abstract: 749,416. Cutting sheet glass. ASAHI GARASU KABUSHIKI KAISHA. July 5, 1954, No. 19674/54. Class 56 Apparatus for scoring glass sheet and subsequently cracking off the scored sheets, comprises a stationary scoring table 3 adapted to support a glass sheet 42; a pair of beds 14, 15 mounted on intersecting guide rails 4, 5 for movement longitudinally and transversely of the table 3, at least one vertically movable scoring tool 38, 39 carried by each bed 14, 15 whereby reciprocation of the bed effects longitudinal or transverse scoring, as the case may be, of the glass sheet and means, disposed beneath the table 3 for cracking off the scored glass sheet. The table 3 is supported by columns 2 from the base 1 and guide rails 4, 5 are supported on the base 1 with rack bars 6, 7 secured alongside, respectively. The rails 4, 5 have sliding grooves 8, 9 and the rails 4, 5 and bars 6, 7 lie in the same plane and intersect respectively at 12, 13, the intersections 12, 13 being notched and part cut off respectively to allow travel across in each direction. The beds 14, 15 have at each end downwardly and inwardly extending portions 30, each having a downward projection 34 to engage groove 8 or 9 and a shaft 33 with inner gear wheel 32 to engage rack bar 6 or 7 and outer gear wheel 31 to engage gear wheel 26 or 27 on shafts 28 or 29 extending longitudinally of the bed 14 or 15. Electric motors 16, 17 are mounted on the beds 14, 15 and have gear wheels 18, 19 meshing with wheels 20, 21 on one end of shafts 22, 23 and which shafts have at their other ends gear wheels 24, 25 to engage the gear wheels 26, 27 to move the beds 14, 15. Switches are provided for each motor to give forward travel thereto and a limit switch to reverse the motor to cause the bed to travel backwards to its starting position, the beds normally resting, as shown in Fig. 1, in a retracted position such as not to prevent movement of the other bed. The scoring tools 38, 39 are carried by holders 36, 37 so as to be freely movable up and down, the tools being lowered only in the forward travel of the bed. In a modification, the transverse bed 15 may have its rails 5 and rack bars 7 extended to provide a second resting place at the opposite side of the table 3, the switches being appropriately altered to allow only the one movement across the table and scoring tools 39 at each side of the bed being lowered alternately at each crossing. The cracking off means comprise longitudinal and transverse bars 43, 44 housed in recesses 40, 41 in the surface of the table at right angles to each other and with predetermined spacings according to the regular sizes of finished glass sheets and above which the scoring tools 38, 39 are adapted to score the sheets 42. The cracking off bars 43, 44 are formed as shown in Fig. 5 to intersect while allowing up and down movement of each separately. Push rods 45, 46 extend through the lower surface of the table 3 to contact and raise or lower the bars 43, 44. The push rods 45, 46 are operated from the front of the table 3 by means of hand operating bars 54 and 61 each having an operating grip 55. Each rod 45, 46 carries a roller 47, 48 in contact with a roller 49, 56 with cam 50, 57, the rollers 49, 56 being mounted on shafts 52, 58 moving transversely of the table 3 and the rollers 49, 56 having pinions 51, 59 meshing with and operated by racks 53, 60 on the bars 54, 61. Springs; as 62, are provided to return the operating bars. Two glass sheets may be cracked off simultaneously, the sheets being scored one at a time and the scoring tools being raised by the thickness of the sheet when the second sheet is placed over the scored first sheet.